Take the airport shuttle bus from downtown, or take the "Aeroporto" - a city bus which stops at the tube station just next to the airport's main entrance. Both of these buses run very frequently; just check the timetables posted on the bus stops to find the best service for your flight.
*All amounts are in BRL. Taxes and surcharges are included. No booking fee is applicable. Prices shown may vary depending on fare availability. You will see the final amount when selecting your payment method.